Pre-fabricated threaded bar assemblies

A pre-fabricated reinforcement cage for longitudinally extending concrete reinforcing bars supporting and extending intimately through concrete aggregate material, comprising:

• a plurality of longitudinally extending concrete reinforcing bars,
• said plurality of longitudinally extending concrete reinforcing bars having an external threading pattern over at least a portion of their length,
• said plurality of longitudinally extending concrete reinforcing bars being held axially aligned in place in an axis by at least two three dimensional cage frames spaced apart from each other,
• said three dimensional cage frames fabricated by welding together plates of said cage frame,
• said plates aligned in the direction of said longitudinally extending concrete reinforcing bars occupying a minimal sectional area of concrete element being reinforced, to minimize any impediment to the flow of concrete, insuring a lack of stress transmission discontinuities,
• said fabrication of said three dimensional cage frames imparting strength and stiffness to the reinforcing cage, using minimal material while affording economical fabrication of a wide variety of said three dimensional cage frames, to accommodate design determined size and spatial geometries, as well as strength requirements,
• said three dimensional cage frames including at least one circumferentially extending plate, said at least one circumferentially extending plate extending axially parallel to said axis of said plurality of longitudinally extending reinforcing bars,
• said three dimensional cage frames each having a plurality of axially extending sleeves, each said sleeve having an internal threading pattern that is complimentary to an external threading pattern of each of said plurality of longitudinally extending concrete reinforcing bars, each said sleeve being rigidly fastened to said three dimensional cage frames,
• whereby said cage frame plates and axially aligned sleeves hold said plurality of longitudinally extending concrete reinforcing bars in an axially aligned parallel orientation while allowing said longitudinally extending concrete reinforcing bars to be rotated freely within said axially aligned sleeves.